Supervisory control system



T. U. WHlTE Dec. '17, 1929.

SUPERVI SORY CONTROL SYSTEM Filed Dec. 17, 1925 10 Sheets-Sheet l INVENTOR Q T/io/msdl fiz/fa BY WITNESSES:

WJW- s ATTORNEY Dec. 17, 1929. wHlTE SUPERVISORY CONTROL SYSTEM 1925 10 Sheets-Sheet 2 Filed Dec. 17

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WITNES SES:

ATTORNEY Dec. 17, 1929. u, wHlTE 1,739,935

SUPERVISORY. CONTROL SYSTEM Filed Dec. 17 1925 10 Sheets-Sheet 3 I BY 60/7/05 [/W/n/e.

Dec. 17, 1929. U WHITE 1,739,935

SUPERVI SORY CONTROL SYSTEM Filed Dec. 17. 1925 10 Sheets-Sheet 4 INVENTOR ATTORNEY WITNES Desi. 17, 1929. T. u. WHITE SUPERVISORY CONTROL SYSTEM Filed Dec. 17, 1925 10 Sheets-Sheet 5 INVENTOR 7770/77d5fl/Vfi/f6. BY

ATTRNEY ESSES:

Q 1929. u. WHITE ,73 ,935

SUPERVISORY CONTROL SYSTEM Filed Dec. 17. 1925 10 Sheets-Sheet 6 3 Q w 0 3 A t E WITNESSES: lNVENTOR ATTORNEY Dec. 17, 19290 T. U. WHITE SUPERVISORY CONTROL SYSTEM Filed Dec. 17, 1925 10 Sheets-Sheet 7 ATTORNEY Dec. ,17, 1929. T. u. WHlTE SUPERVISORY CONTROL SYSTEM Filed Dec. 17. 1925 10 Sheets-Sheet 8 MGM MSW S E S S E N n W ATTORNEY Dec. 17, 1929. T. 0. WHITE 1,739,935

SUPERVI S ORY CONTROL SYSTEM Filed Dec. 17 1925 10 Sheets-Sheet 9 ATTORNEY Dec. 17, 1929. HITE 1,739,935

SUPERVISORY CONTROL SYSTEM Filed Dec. 17 1925 l0 Sheets-Sheet 10 587 WNS SS: I INVENTOR I f T/MMUSdWfi/fif 4 g g BY ATTORNEY Patented Dec. 17, 1929 PATENT OFFICE THOMAS U. WHITE, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA SUPERVISORY CONTROL SYSTEM Application filed December 17, 1925.

My invention relates to selector systems, and particularly to selector systems of the supervisory control type.

An object of my invention is to provide means for the selective control and supervision of remotely positioned mechanism.

Another object of my invention is to pro vide means for protecting against the incorrect operation of'remotely disposed mechanism.

Another object of my, invention is to provide means for selectively varying the characteristics of remote mechanism and simultaneously receiving back indications of the extent of such variations. I

Another object of my invention is to provide means for automatically transmitting from a distant point changing conditions thereat such as voltages gate openings, temperatures and etc.

Another object of my invention is to provide means for increasing the number of supervisory operations without increasing the original number of selectors.

Another object of my invention is to provide means for obtaining multiple selections on the selector switch twenty-five impulse system.

Still another object of my invention is to provide means whereby a plurality of stations may be operated over the same selectors.

Another object of my invention is to provide mea is for increasing the number of perations that may be performed with a single set of selector switches.

When power systems become large. the mechanism for supervising and controlling the increased number of equipment becomes unduly complicated. In such cases, it is essential to devise means for performing the number of operations than heretofore .ry with approximately the same apparatus as was formerly used.

The invention herein disclosed shows circuit arrangements which perform these larger number of operations using substantially the same amount of mechanism for selection were heretofore used for the lesser number of operations. The development supervisory control has called for Serial No. 70,008.

the performance of a number of new operations such as control of gate openings, temperature and oil gauge readings. The means for performing all these functions are all embodied in the present invention.

In practicing my invention I use in addition to the well known finder switch an additional finder switch for first selecting the group in which the operated key is located the code sender being common to all the keys. At the receiver by means of a switch over relay twice the usual supervisory operations take place.

Figures 1, 7, 8 and 9 show the circuit arrangements at the dispatchers oifice embodylng my invention.

Figs. 2, 3, 4, 5, 6 and 10 show the circuit arrangements embodying my invention at the substation.

The system comprises, a control, supervisory and common return line connecting a dispatchers oflice and a substation. At the dispatchers oflice are located keys, supervisory lamps and selector mechanism. At the substation are located power mechanism and similar selector mechanism.

The selector mechanism enables the association of any key at the dispatchers office with its equivalent power mechanism at the substation to thus place the mechanism under the control of the dispatcher.

In Fig. 1 106 and 109 are the finder switches for finding the particular group of keys in which the operated key is located, such as individual key K. The finder switches are numbered 128 to 126 and code-sending switches 143 to 146. In Fig. 2, the code receiver at the substation comprises the switches 209 to 212 and its associated relays 200-208. In Fig. 3, relays 301 to 304 con trol groups of circuits and relays 305 to 314: control the particular circuit of the group associated with the substation apparatus desired to be operated.

In Figs. l, and are shown the substation apparatus with its associated mechanism for transmitting supervisory indications. In Fig. 6 the supervisory sender comprising finder switches 609 to 612 and code-sender switches 048 to 651 are shown. In Fig. 9 keys K--1 and K-2 are shown. It is understood, of course, that similar groups are snmlarly associated with the station finder switches 106 to 109. The lamps 947, 948, 951, 952, 955 and i 956 aresu aervisor 1 indicatin lam 3s. Kevs K5, K6 and etc. control the locking circuits of their individual key-operated relays 900,

901 and etc. In Fig. 10 are shown circuit arrane'ements f r transmitting oil and temperature readihg'sto' the dispatchers panel.

In transmitting an operating impulse to code switches are stepped over t eir contacts to transmit a code comprlsing two pause perioc Tinseoue is individual to each key.

The code is received at the substation causset of switches to rotate to select the power mechanism according to the code which is to be operated.

Upon the closure of this power mechanism responsive to this operating impulse described, a set of finder switches are rotated to find the power rnec ian'isni which has been operated and its new condition; Responsive to this operation, a set. of switches are rotated to transmit back tothe 'dispatchers office a code comprising two pause periods. This code indiiiid'ual to the power mechanism operated and its eondition.

The code is received at the dispatchers office bythe switches which cause supervisory lamps, shown in Fig. an) operate toiiidic'ate thenew conditioner thepower mechanism; This, iii brief, is the generai operation which takes. place responsive to tie closing of the key by the dispatcher.

In Figure 1, the switches to are the. means for first findingthe particular station or group to which an operating code is to be sent over lines 19 and 20 or 21 and 22 each line being associated independently with a station. I I

Another novel feature is the circuit arrangements at the substation by. which the number of supervisory signals that. can. be sent using the 25 contact code sender switch is doubled. The arrangement for performing this is shown in Fig. 5; 'VVhen relays 513 and 514 are ei'i'ergized, they transfer the circuit to the code sender of supervisory mechanism froth any one of the first five contacts, to

a corresponding one on the second live contacts. The relays 5'13 and514 when energized close the contacts of relays 512 and 510 for operation and de-energization of relays 513 and 5l4 cl'ose the contacts of relays 511 and 509 for operation. A contact from the supervisory apparatus which would normally, for example,,have been connected to the third contact of the code sender switch 648,1s trans ferred by the energization of 513 and 514 to the 8th contact of the code sender 648.

Another feature of this invention is the circuit arrangement for operating an induction regulator located at a substation from a main station and also placing meters across power circuits for transmitting back to the d1s- ,pat'ch'er on a separate line and independent of -other operations or meter indications.

In Figurel, by the operatitin-of the dispatchers key, relays 415 or 416 are energized, as willbe explained later, to reverse the current in the otor 413, whereby the resistance 411 1s elther cut out orinserted in the circuit of the field winding 432 of induction regulator 401 and also in thecircluitof field 481.

Relay 419 and clay 450 are also controlled by the dispatchefls key to place. the Kelvin balance 425 across the power line by the erir- 'gization of relay 418. A galvanoineter 429 operated as a result and transmits its readings to operate a meter at the dispatchers ofi'ice over the lines 250 and 251, which are indcpen dent'of the regular operating and supervisory lines. Simultaneously, supervisory iii dications are sent over. the regular supervisory lines to indicate that the correct meter was placed across the line. By the arrange: ment shown at 408, supervisory indicati of the gate opening 407 are also transmitted,

In Figure 10, circuit arrangements for t-ransrnictingoil gauge and temperature gauge readings to the dispatchers panel are shown.

In order to better illustrate this invention, a description of the operations which take place when a key is closed will becxpl'ained. As illustrated in the drawing in Fig. 5, the

circuit breakerG is shown open. Let be assumed that the dispatcher desires to close this particular circuit breaker; To do this the dispatcher will close the left-hand contacts of K-1 and the contact of K 8. 7

As a result 01" this operation, a circuit will be completed from ground at key Ii-f? the upper left-hand contacts 914 of K'1, relay 901, armature 946, battery to ground. Relay 901 individual to the key will be energized to close the contacts of its arma'tures. Acircuit for the key indicating lamp 923 will be completed over armature 919. v A locking circuit for relay 901 will be completed overK- 5 and armature 920. Y v

A circuit will also be completed from ground, contacts of switch K3, lower left contact 914' of K1, line 16, relay 101, battery to ground. Belay 101 individual to a station or group of keys, closes a circuit for the stepping magnet of the station finder switches over armature 115 and stops these ion a locking circuit for itself from ground through battery, relay 101, armature 114, conductor 15, armature 922, and K5 to ground.

At armature 115 of relay 101, a circuit is completed for the stepping magnet 104. This stepping magnet opens its own circuit at 112 and operates as an interrupter to step the wipers 106 to 109 from contact to contact. The pawl controlled by the stepping magnet is positioned preparatory to stepping the wipers upon the energization of the stepping magnet and steps the wipers upon deenergi- Zation of the magnet. lVhen the wipers 106- 109 reach the contact associated with the station or group in which the operated key is positioned, a circuit is completed from ground, armature 116 to second contact of bank 109 and relay 100 to ground. Relay 100 is part of theswitching mechanism functioning to stop rotation 01 the wipers when they reach the correct contacts. As a result of the energizaticn of relay 100, the circuit for stepping magnet 104 is opened at armature 111. A circuit paralleling relay 100 is completed over wiper 108 to relay 156, thus preparing a closed circuit for conductors 19 and 20, the conductors associated with the station or group associated with the operated key. In this manner, a selection of the group in which the operated key is located is made simultaneously with a selection of the conductor over which the signals are to be sent.

Another result ofthe energization of relay 100 is to close a circuit for the stepping magnet 105 which steps the finder switches 123* 126. This circuit is completed from ground, armature 110, armature 119 stepping magnet 105, armature 178, armature 128, armature 118, armature 180, and battery to ground. The particular station or group having first been found by the first mentioned set of finders, the second set now rotate to find the particular operated key.

Energization of stepping magnet 105 steps the wipers 123 to 126 in a manner similar to the operation of stepping magnet 104 until 123 reaches the contact 127 associated with the operated key. At this point a circuit is completed from ground, contact 127 of bank 123, line 12, armature 921, line 14, bank 107, its second contact, relay 102, battery to ground.

As a result of the energization of relay 102, the ci .it just completed for relay 105 is opened at armature 118. At the same time, the battery for the circuit of stepping magnet 105, just traced, is transferred over the upper contact of armature 118 to relay 160, bank 143 to ground. Relay 160 is associated withthe code sender. Energization of relay 160 energizes relay 161 and energization of relay 161 energizes relay 162 which opens the circuit for the relay 164 at armature 186.

The code sender will now function to transmit a code which comprises 25 impulses with two pause periods determined by the stopping position of the finder switches mentioned above and a third pause at the 25th contact.

A further result of the energization of relay 102 is the energization of relays 163 and 157 over a circuit from ground through armature 117, relays 163 and 157 in parallel, armature 195 and battery to ground. [is a result of the energization o1 relay 157 which is the code transmitting relay, its armature closes the final contact of the line circuit 19-20 at 177 and transmits the first code signal.

One result of the de-energization of the relay 164 is the energization of relay 167 over a circuit from ground battery armature 190, relay 167, armature 191 to ground. Energization of relay 167 energizes relay 166 over the armature 194. As a result of the energization of relays 163 and 166, a circuit is completed from ground, armature 193, and its front contact armature 192 and its back contact armature 187, stepping magnet 168, bank 144 and its contact, armature 190, battery to ground. Stepping magnet 168 steps the banks 143 to 46 when (ls-energized from an energizer; state.

As a result of the energization of relay 168, it places its pawl in position to step the banks 143 to and, at armature 195, opens the previously traced circuits for relays 157 and 163. De-energization of relay 157 opens the line circuit atarmature 177 of the first operating impulse.

De-energization of relay 163 opens the previously traced circuit for stepping magnet 168 at armature 187. Upon the de-energization of relay 168, the wipers 143 to 146 are stepped from the first to the second contact. As a result ofthe de-energization of relay 168, the circuits for relays 157 and 163 again closed at armature 195. Energization of relay 157 closes the line circuits 19 and 20 at armature 177 for the second impulse oi the operating code. Energization of relay 163 closes the circuit for stepping magnet 168. This cycle is then repeated, relay 168 being intermittently energized and de-energized to step the wipers 143 to 146 from contact to contact.

l Vhen the wiper 145 reaches the third contact 148, a ci "cuit is completed from ground, battery, relay 165, wipe 145, its third contact, the first contact ot the first group of wipers 124, armature 113 to ground. inergization of relay 165 opens the circuit for the stepping magnet 168 at armature 192 preventing its energization over the armature 187 heretofore traced. Another result of the energization of relay 165 to de-energize relay 167 at armature 191. During the period, while the stepping magnet 168 is deenergized, relays 157 and 163 remain energized over the circuit previously traced infor the end position. Relay 157 energized circuit 19 and 20 at armature 177 for the 10x) relay 166 is de-ena. zed after an interval of p. time and the circuit 15 again com letecl for n o I:

the stepping naguet 108 irom ground, armature 193 and its back contact, armature 192 and its rout contact armature 187 rela a J 168. Wioer 144 armature 190 batter to ground. Enereization of relay 168 prepares the pawls to step the Wipers 143 to 146 and also, as n'eviously pointed out, opens the circuit for the relays 157' and 163 at armature 195. De-enorgization of relay 157 opens the line circuit at armature 177 for the end of the P pa 'e period.

111 L Decnergization of relay 163 opens the circuit for the stepping magnet 163 at armature 187 and the Wipers are stepped from the third to the fourth contact and the circuit for relay 165 is new opened at bank-145 de-energizing the relay 165. ltlelay 167 is energized over a circuit previously traced from ground and armature 191. Energization of relay 167 energizes relay 166 over a circuit includ ing its armature 194. r

The circuit for the stepping magnet is new again completedover the original circut with armature 193 inits upper position and armature 192 in its lower position. lnr pulses are new again sentover the line While the stepping magnet 168 intermittently stepped, as explained belore, until the Wiper 145 reaches contact 153; A circuit is then completed from ground battery to relay 165, wiper 145, its contact 153, contact 135, Wiper 125, armature 120, armature 113 to ground. Energization of relay 165 again opens the circuit for the relay 167, as traced before, at its armature 191 and opens the circuit for the stepping magnet 163 at the armature 192 at its upper position. During the de-energization period of relay 16S, relays 157 and 163 remain energized over the circuit previously traced, including armature 195 in its closed closes the line l.920 is opened at armature 177 for the end of the second pause period.

De-energisation oi relay 163 opens the circuit for the stepping magnet 168 at armature 137 and the Wipers are stepped to the lay 166 at armature 194. v

A circuit is now again completed over the original circuit for the stepping magnet 168, Wlnch continues to step the wipers 143 and 146 until the 25th contact is reached; At the 25th contact, the circuit for the stepping magnet 168 is opened at the bank 144 and relays 157 and 163 are held energized over a circuit including armature 195 during this de-energization period of relay 163.

A third or twenty fifth synchronizing pulse pause period occurs at this time and the code sender immediately -functions to reset the Wipers 143 to 146 to their normal or first position. Thiswill be described. later.

When the relay .157 is closed to transmit the first code impulse over the lines 1920, relay 200 at the substation is energized. Energization of relay 200 closes an energizing circuit for the relay 202 -at the armature 213.

A circuit is also closed for the stepping 1nagnet 208 at armature 214. When the relay 157 is opened at the end of the first impulse period, the circuit for relay 200 is openedand the relay is Clo-energized.

As a result of the de-energization of relay 200, the stepping magnet 208 is lo-energized and the Wipers 209 to 212 arestepped from the first to the second contact a manner similar to that described in connection With the banks143 to 146.

' When the Wiper has passed itssecond contact, av circuit is completed from I ground, Wiper 211, its second contact, armature 218, relay 201, battery to ground. Relay 201 is energized to open a circuit at armature 216.

This circuit is the final operating circuit for operating the mechanism associated With the particular key closed. In order to insure that the correct mechanism has been selected, its circuit is held open at armature 216 until the 25th pause period. This pause period must occur simultaneously at both the dispatchers office and the substation to de-energize relay 201 and close the circuit. This will be explained more thoroughly hereafter. A further result of the de-energization of relay 200 is to energize relay 203 from ground over armature 213 and its back contact, armature 217 and its front contact, relay 203, battery and ground. Energization of relay 203 energizes relays 204 and 205 over the armatures 222and 221, respectively.

Energization of relays 204 and 205 opens the selecting circuit for selecting first the group and then the particular relay circuit of the group at armatures 223 and 224. Since the group selection is to take place only during the pause periods, it is apparent that the selecting circuit should be held opened until the pause periods occur. Relays 20 i and 205 perform this function and, as Will be hereinafter explained, one of these relays Will be de-energized during the pause periods to close the selecting circuit.

A further result of the stepping of the Wipers to their second contact is the energization o1 relay 206 from ground, battery, relay 206, bank and Wiper 212 to ground. Energization of relay 206 prepares a locking circuit for relay 207 at armature 226 and also prepares a locking circuit for selected relays at armature 225, as will be explained hereinafter. i

The relay 200 is now intermittently energized and de-energized in response to the hereinbefore-mentioned signals and energizes and de-energizes accordingly the stepping magnet 208 and the Wipers 209 to 212 are stepped from contact to contact. When the first pause period occurs, relay 200 remains energized, due to the fact that the line is closed during this period. The stepping magnet 208 is also held energized at armature 21 i.

Since the iirstpause period occurs When the Wipersare on their third contacts, the

relay 204 Will be ,heldenergized over Wiper 210 at its third contact. After an interval of time relay 205 Will be tie-energized at bank 210 and Will close. at its armature 22s the first selecting circuit Which extends from ground, Wiper 212 and its bank, armature 219 and its front contact, armature 22 i and its closed contact, armature 228 and its closed contact, Wiper 209, contact 229, line 24:2, armature 315, relay 304 battery and ground.

Relay 804i is energized to close the contacts of its armature. A locking circuit for relay 30 1 is completed from ground, battery, relay 30 i, its contact 330, line 240, armature 225, closed, to ground. A circuit is also closed for the relay 800 from ground, battery relay 300 over the contact 331, to ground. Energization of relay 300 opens the circuits for the group relays 301 to 30 at contacts 315 to 318 in order to prevent any further energizetion of any of these group relays.

At the end of the first pause period,relay 200 is ale-energized. to in turn ale-energize stepping magnet 208 and the Wipers are stepped to the next. contact. Relay 205 is again energized over contact 210. It is un derstood, of course, that relays 204i and 205, being slow-release relays, do not de-energize during the comparatively short intervals, While the Wiper 210 is oil their respective contacts.

The second series of impulses nov. continue to be received over the line thereby intermittently energizing relay 200, which, in turn, intermittently energizes the stepping magnet 208 until thesecond pause period is reached. The second pause period occurs on the 16th contact 158 of the bank Wiper 145. The bank 209 Will, therefore, be on the 16th contact 23 1 when the second pause period occurs. The relay 205 Will be energized over the Wiper 210 at the 10th pause period. Relay 20 1 will, after an interval of time, be de-energized, due to the fact that its circuit is opened 'e Wiper and bank 210.

hen relay 20a is ce-cnergized, a selecting circuit is completed, as traced before, except at this time the Wiper 209 being on the 10th contact, the circuit is completed over contact 23% and line 2 17, relay 306, to battery and ground. Encrgization of relay 306 prepares a locking circuit for itself from ground, battery, relay 306, contact 337, line 2-fl0, over armature 225, closed, to ground. A circuit is also completed from ground, contact 335, line 241, Winding of relay 207 to battery and ground.

Energization of relay 207 closes a locking cinuit for itself over its armature 227 and armature 226 at their front contacts. A further result of the energization of relay 20? is to e 1 all selecting circuits at armature 228. No further selection can now be perforn'ied.

At the end of the second pause period, relay 200 is again de-energizcd and the step pi ,e; magnet 208 is ole-energized to step the i 1 cl: to the next succeeding contact. The

third group of impulses are noW received over the line to intermittently energize and ale-ener ize relay 200, which, in turn, intermittently energizes and deb-energizes the stepping magnet 208 and the Wipers are stepped around banlr contacts.

Vihen the Wipers reach the 25th contact, the previously traced circuit for the relay 201 is opened at the Wiper 211. After an interval of time, the relay 201 is tie-energized. It, therefore, the third pause period over the line occurs at this instant, suiiicient time Will elapse to permit relay 201 to be (ls-energized am. the operating circuit will be con'ipleted over armature 210. Should the groups of banks at the two stations not be in synchronism, the third pause Will not occur when 211 is on its 25th contact, as a result ofwhich relay 201 Will not have had time to de-energize and nooperation will talre place. This insures against operation of any incorrectly selected mechanism. In other Words the selector switches must have been in synchronism so of relay 503 closes the circuit breaker C which is'associated with the key closed by the dispatcher. The restoration to normal of the mechanism at the control receiver ig. 2) will be explained hereafter. I

The normal condition of the relays 507 and 508 is, as will beexplained later, energized, these two relays being energized in a series circuit including armatures 529, 527 and 523.

When relay 501 is energized, relay 507 is short-circuited over a circuit from mid-point between relays 507 and 508, armature 524 and 518 with its contact closed. As a result relay 507 is deenergized which in turn opens a circuit for the relay 508 at the armature 529.

. Upon the closing of the circuit breaker, a circuit iscompleted from ground over contacts 521, armature 531 and its closed contact,

relay 505 to battery and ground. As a result of the energization of relay 505, acircuit is completed for relay 506 from ground battery,

relay 506, armature 528, armature 523 to ground, Relay 506 is energized over this circuit and closes alocking circuit foritself at its armature 526. As a result of the de-energization of relay 508, circuit is completed from ground, armature 533, line 566, relay 604 to battery and ground, One result of energization of relay 604 is to close a circuit for the stepping magnet 606 ffrom ground of armature 620, armature 622,

relay606, armature 623, armature 624 arma-.

ture 626, battery and ground. A further result ofthe energization of relay 604 is to complete a circuit from ground over armature 618 over armature 614, and its back contact,-

arrnature 621 and its'front contact, line 565,

, Winding 513 and5l4'in series to'battery and ground.

of the armature 514a of relay 514 while the 8th contact connected to conductor576 is associated with the back contactof armature 5144'; Similarly, the 4th contactis connected through conductor 57 3 to the front contact of armature 51413 and the 9th contact is connected through conductor 574 tothe back contact of 51.4 B. This multiple connection permits the performance of double the usual number of supervisory operations. By. dividing the supervisory operations into two groups, one group extending through the contacts of relay 512 and the other group ex-- tending through the contacts of relay 511.

The

In order to decrease the number of contacts necessary in each group, the contacts are further divided so that relays 512 and 510cm:- trolthe apparatus; units in one'group'and relays .511'and 509 inthe other group, the apparatus of one group is operated to sendfa supervisory indication when relays 5133and 514 a-reenergized; It the supervisory apparatus functioning is in the other group, reiay 516 and 514 are de energized and the armatures at their lower position transfer the circuits from 1st to 5th to the 6th to 10th contact on the code sender.- V

In this particular case, the circuit breaker C is in the first group mentioned and relays 51-3 and 514 are energized over circuitsalready traced.

As aresul-t of the energization oiirelay 606,

its pawl is placed in position to step the finder switch wipers 609 to 612 to their second contact and simultaneously, the relay 606' opens its own circuit at armature 622't o deenergize itself and step the WIPQI'S to their secoiid contact. This relay acts as vibrator stepping the'wipers fromconta'ct to contact,

When the wiper 611 reaches'its contact .664, a circuit is completed for grounded wiper 611, its contact 634, line 560, armature 530, line 559, relay 607 and battery and ground.

Energization of relay 6,07 opens a circuit for the stepping magnet 606 at armature 624 and the wipers 609 to612 stop. I

Simultaneously with the de-energiza-tion of relayf606 the circuit for the stepping magnet is transferred at armature 624 to relay" 639 over acircuit from ground, battery arm ature 626, armature 624, and its front contact,

relay 639, b'ank 651 and its wiper to ground.

' Energization of relay 639 energizes relay 640, at armature658 which in turn energizes relay 641 at armature655. A locking circuit is "completed for the relay 607 at armature Relay 643 is tie-energized a tar-mature As a result of the de-energization "ofrelay" 643,-a circuit is completed over its armature:

660' for the relay 645. Energization ofrolay 645 completes :an energizing circuit for the relay 644 atarinature 664.1

A further result of theenergization' of relay 607 is to complete a circuit from ground, armature 625, relay 642" and 638' in parallel, armature 667., battery and ground; As a re sult of the energization of relay 668, the ciri-cuit for lines 676 and 67 5, isconipleted and armature 6'52 and the first supervisory 1m pulse is transmitted. r

A circuit is now completed for the stepping magnet from ground, armature 665 and it's I back Contact, armature-666 and its front contact, armature 659., stepping magnets 647,

,wipers 649Iand itscontact, armature'660, bati' tery to ground. Stepping magnet 647 is energjizedjover this circuit .to prepare its pawl to step the wipers 648 to 651 one step and ies tfu ther result of the energization of the epping magnet, the circuits. previously forthc relays 648 and 642 are opened at armature (56?. llclays 638 and &2 are de-energized as i.. result of this. The first "u impulse is ended at this time by sing-ct the circuit at armature 652. .s-energization of relay 642 opens the cir iit or the stepping magnet 647 at the armature 059.

it is apparent from the circuits thi s tar tracer. that the supervisory code sender is identical. with that oi the operators code sender and the circuits need not therefore e aced in detail. Relays .2 and 638 are intermittently energized with the stepping magnet 04'? until the wiper 64S reaches its third contact. At this point a ClYCLllL is coinnletcd for the relay 64.6 from groui'ich battery, clay 64x6 wiper 048, its third contact,line 5, armature 5140; and its front contact. line 71., fir t group 636, wiper 612'to ground.

Relay 640 is energized over this circuit open the circuit l r the stepping magnet to at armature 655 and to open the circuit for the relay 64' at armature 666. lhis results in the first pause period and relay 638 and 0 22 reinain energized.

After a interval of time relay 64:5 opens a circuit or relay (i llwhich in turn deenergizes .nd the circuit for the step; inn; magnet is again cinpletec over the front contact of armature 665 and the hack contact of arn'niture 663. Energization of the stepping niagnet denergizcs relay 638 and 6&2. This ends the first pause period.

De-energization of relay 042 opens the circuit for the stepping magnet at the armature 059 and the wipers are stepped t the 1t succeedinc' contact. The circuit for the relays 6&6 then opened as the wipers 64:8. he de-energiza tion of relay G46 energizes the which in turn energizes relay 64% and the circuit is again completed for the stepping magnet over the back contact of armature 005 and the'iir ont contact of arreature 663.

The stepping; magnet 64? and the relays 642 038 are now alternately energized and tie-energized to send the second group upeiyisory code gnals. When the wiper reaches the ontact 672, a circuit is compl ted ran ground through the battery, r lay wiper 6-18 its Contact 6'72, conducr 563 armature and its front contact,

t 536. conductor 577, contacts 629, wipers 609 to ground. Relay 6&6 is energized over this circuit to open the circuit oi the acnet which in turn closes the cir- Jjlt f is relay 638 and 64t2-and the second pause period ta res place.

As stated before, the relay (l -l5 1s de-energized '11 turn to de-energize relay 64A after which the circuit for the stepping magnet is again completed. Energization of the stepping magnet (lo-energizes 638 and 642 to end the first pause period. De'energization or relay (i l-2 opens the circuit for the stepping )ped i iiclay 04o P magnet at 659 2nd the wig ers to the next succeeding contact. new tie-energised to in turn 045 which in turn energiz The third group of traisniitted while the steps the Wipers (i i-.8 to contact un'il the th con this instant the circuit for is opened at wipers 651 sender to normal as will is inait-er.

A circuit is now completed t through WEPQT 051, contact 61M, nd battery to ground. Energization relay 50S opens another point in r 1 y '1 u D A-TH 1 0L way our: ant ClJSoS a cncuit rroin grouni. through armature 6; i, arn ature (522' wipers 0 n on s ps4- oiO and its t con itLb cont lit/e01 tact 54-0 to In L hetween relay. 07 and battery to ground. Relay 507 P and completes circ 0111 i iattery re ays F0? and 508 in cur R20 u Umd to ground.

are new restored to normal prcoaral. y A, g 5

tory to receipt o1 further operating i. r ()peningz; and closing; of the conductors and 670 armature- 652 energizes and de energizes relay 712. Energization of relay 712 energizes relay 711 over armatur T l an l also the stepping; magnet 206 at arnia 742. Upon the dc-cnerylnatio ris L relay 708, at arinatur operating circuit. 1 iis i gized until the 25th pause anlzs 718 to 710 reaci inultaneously with the hanks 6&8 to 651, the pause win the proper time i and close the operating Cll operation will take place false signal must have ee: locks itself through t ie C or ture 730. A circuit cilso completed in parallel with the relay 708 n ugh the arenature 733 and its back contact, armature 740 and its closed contact, relay 703 and battery to ground. This will close a circuit for the lamp 7 22 and relay 7 04; to give a supervisory indication of the receipt of the first super.- visory impulse. Energization of the relay 7 01 also closes the circuit for the buzser70'5 to call the attention of the dispatcher of the receipt oi the supervisory impulse. .If the operation of the circuit breaker was autoc-ll'littlC, that is, independent ofthe operation tact until the first pause period occurs.

preparatory to stepping the Wipers.

by the dispatcher, this would be the only 'means the dispatcher would have to call his attention to the receipt of supervisory indi cation so that he could'watch his lamps to observe wher the change tookplace.

The signals now continue to be received and the wipers are stepped from contact to con.-

has already been pointed out, the conductors 675 and 676 are energized during this period ductor 7 63, relay 81'5and battery to ground.

Energization of relay 815 closes a locking circuit for itself from ground through battery, relay 8153, contact 838, and armature 736 to ground.-

A circuit is also completed from ground through battery, relay 816 and contact 837 to ground. Energization of relay 816 opens the contacts of the circuits of the relays 1813 to so as to prevent any further energizetion of this group of relays. 7

At the end oi the pause period, the stepping magnet 7 06 is tie-energized to step the wipers to the next contact and they are con,-

, tinned to be stepped until the 2nd pause pc- 7 now th riod. The selecting circuit just traced is again completed over bank :7'13and its contact 7 17 overconductors 7663, relay over conductor 774 and armature 736 to ground. A circuit is also completed for relay 700 om ground through battery relay 7 00, lines 762 contact 827 to ground." Relay 700 is energized to open the circuit at thearmature 718 to prevent any further selection for relay 700, at the arnfiatures 717, and .735,

' The wipers new continue to be stepped un- L 1.1 I L, L118 Ci ti]. ie 25th contact is r-eachedil At the, 25th smut for the relay 708 previi wiper, and arter an interval if the pause The locking circuit is also completed ned at bank 715 and its riod occurs at this time, armature 7 31'closes its contact. 7

A circuit is the; completed from ground, wipers 715, armature 731, conductor 761, contact 826, contact 835 conductor 854, relay 907 and battery to ground. Energization of v relay 907 will pull up its armatures 9415 and 94.6 which are locked in position by the armature 9&4; The original locking circuit lor the rclay901 is now opened at armature 946 and a new locking circuit is prepared for the re lay 900 at the front contact of armature 9 The circuit for the lamp 9 18 which indicates an open condition of the circuit breaker, which up to this time has had its circuitcom plcted throughthe armature 94:5 a-ndits back contact is now opened and a circuit is completedfor the lamp 947 to give to the dispatcher a supervisory indication that the circuit breaker has been closed. This completes. the operation and supervisory signalling when thedispatcher operates key to close circuit breaker.

In similar manner, the operation of any other key such asKf2 operates to control the mechanism at the distant station. Operation of any key in other groups would operate in the same way except that being connected to different contacts on the banks 106 to 109, these would stop at different contacts to energize relays other than 156 as illustrated to close the associated circuits for other conductors than 19 and 20 c Similarly, it will be understood that, upon the energiz ation of any other group'selecting relay 813 or 814 and a final selecting relay 8.03 50808, other signalling devices will operate in response to the operation of their in.- V dividual un ts at the remote station. Thus,

forexample, relays 809 to 811 are individual to specific units at the remote station. In re spouse to the energization of relays .81 1 and 808 a circuit is completed for relay 811, it

. beinggundersoodthat relays 8lfiand808 Will ener 'ize in res aonse to a code which is transmittedby the uni-tfin-dividual to relay811 loo Energization of relay 811,in turn, illumi- I f nates lamp 846, indicating to the dispatcher the operation of the remote unit individual to relay 811. Similar operations occur in connection with relays 809. and 810.

The operations that take place to restore the operation to normal will now be ex plained. The relay 101 which has beenheld locked through a "circuitcomprising the armature 922 is deenergized as a result or the de-energization of relay 901,-the circuitot which in turn was opened at armature 946.

The de-energi-zation of relay 101 opens the circuit for relay at armature 116p The relay 102 which was held energized-over armature 921 is de-energized and opens thefinal circuit for the stepping magnet 105. The circuit for the relay is v'openedat the bank and its wiper .1 13, its armature 182',

vibrates for a while in order to hold the code signalling apparatus energized during the 25th pause period. After an interval of time, it stops between its contacts and opens the circuit for the relay 161. Relay 161 is deenergized after an interval of time to'de-energize the relay 162. As a result of the deenergization of the relay 161, relay 162 is tie-energized and a circuit is completed for the stepping magnet from ground through armature 189, stepping magnet 168, armature 188, and its wiper 146, armature 195 and battery to ground. The stepping magnet 168 is energized and opens its own circuit at 195, upon the de-energization of stepping magnet 168 and the wipers 143 to 146 are stepped from the 25th to the normal or 1st contact. Relays 157 and 163 are de-energized at armature 117 and the circuit for the relay 167 is opened at armature 190. Relay 166 is de energized by the opening of the circuit of the armature 194.

At the sub-station upon de-energization of relay 200, relay 202 is de-energized after an interval of time and the circuit for relay 201 is opened at wiper 211 on its 25th contact. The relay 203 is de-energized at armatures 217. Relays 204 and 205 are in turn de-energized at armature 222 and 221 respectively and bank and wiper 210. The stepping magnet 208 now completes a circuit for itself over its armature 220, armature 219, bank and wiper 212 to ground. The stepping magnet is energized and then de-energized at armature 220 to step the banks from the 25th to the 1st contact. Relay 206 is now opened at bank 212 and it in turn opens the circuit for the relay 207. In a similar manner the supervisory sender and receiver are restored to normal.

In a manner similar to that already clescribed the dispatcher can send operating signals to operate either relay 415 or relay 416 momentarily energized at the 25th contact of the code receiver. Energization of relay 415 will close its armature 447 and 448 to transmit current through the motor 413 in one direction, to rotate the arm 412 in one direction to change the resistance. Energization of relay 416 will reverse the current from 413 to cause it to rotate in the opposite direction. If the resistance is increased in the first instance given, it will be decreased in the second example and correspondingly vary the current. in a field magnet winding 432 in series with it. In response to the energization of relays 415 or 416 for a limited time, the arm 412 will be rotated a given amount and if it is desired to further rotate the arm, further codes will be sent to again energize relays 415 or 416.

By operating relays 419 or 420 in a similar manner by operating impulses from the dispatchers oflice, the Kelvin balance 425 can be connected across the line by energizing relays 418 to close the contacts across the secondary winding of the transformer 417. In-

dications of this meter are transmitted over the lines 252 and 251 which are mdependent oi the operating and supervisory signalling conductor whereby continuous meter indications may be obtained with non-interference by signalling.

Relays 418 and 419 are energized as described above, the Kelvin balance operates,

and a current is transmitted from ground 1 ernor 402 regulate the gate opening 407. The

amount of gate opening is indicated to the dispatcher by the movements of the contact over stationary contact members 408 which controls the relays 409 and 410 to send supervisory indications in a manner similar to the supervisory indications already described. When the gate opening changes, as for example, to engage contact 408, an energizing circuit is completed for the relays 409 and 603 in series. Relay 409 operates its armatures 443 and 444 into engagement with their front contacts. Encrgization of relay 603 completes a circuit for the stepping net 506 which thereupon steps the finder switches 609 to 612 until the position individual to the gate and .its particular opening is reached. Thereupon the codesender switches 648 to 651 are started into operation to trans mit a code to the receiving station equivalent to the particular position at which the switch wipers stop and this code, of course, is individual to the particular gate and its opening Similarly, by the operation of indicator 1021 and 1046 the oil gauge and temperature gauge indications can be transmitted to the dispatcher.

The system described discloses one modified form to which my invention may be applied. It is obvious, however that there are a number of other systems which are based on the same principle of selection as disclosed and to which accordingly my invention may be applied. I do not intend to limit myself to the particular form used to illustrate my invention except as specified in the appended claims.

I claim as my invention:

1. In a supervisory control system, a first station, a second station, apparatus units at said second station, signalling devices individualto each ofsaid apparatus units at said first station, a signalling line connecting said stations, at finder switch at said second station comprising a bank of contacts, a code sender at said second station including a bank of contacts, circuit extending from a contact on said finder bank to a plurality of contacts on said code sender bank, an electromagnetic means interposed between said finder switch and said code sender for selectively determining which of said plurality of contacts on said code sender bank is extended to the said contact on said finder switch bank, said apparatus units at the second station being arranged in groups, means responsive 'to the operation of oneof said apparatus units in oncot said gronps for energizing said electromagnetic means interposed between said finder and said code sender, means controlled by the operation of said apparatus unit for operating said finder to said mentioned contact "on the finder bank, means responsive to theioperation ,of'sa-id finder to'start said code sender-for transinitting code combinations of impulses to :said first station and means at said first station responsive to said .code cornbinations of impulses for operating the signailing device individual to said operated a p paratu-s unit. a a

i 2. In a .Si lpervisorycontrol system, a first station, ,a second station, apparatus units at said second station, signalling devices individual .to each of said apparatus units at said first station, asignallingline connecting said stations, a finder switch at said second station comprising a bank of contacts, a code sender at said second station including a bank of contacts, a circuit extending from a con.-

tact on said finder bank .toa plurality of 0on tacts on said code sender bank, an electromag netic means interposed between said finder switch and said code sender for selectively det rmining which of said plurality of contacts on said code sender bank is extended to the said vcontacts ,on said finder switch bank, said apparatus units .at the second station being arranged in groups and each contact on the finder being common to a group, means controlled by the operation of any one 01 said apparatus units for operating said tinder switch to position lIlCllVldLliLltO the group and for selectively operating one of said electromagnetic means, means jointly controlled by said finder switch and said electron agnetifc means for controlling the transmission of a code by said code transmitter over said signalling 1ine,=and.1nea-ns at said first station responsive to said code for operating the signalling device individual to said operated apparatus unit in accordance With the operation of said unit.

In testimony whereof, I have hereunto subscrlbcd my name this {lth day of November,

' THOMAS U. WHITE. 

